fix: eliminate TOCTOU races in catalog_fetch() - #3910
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Pull request overview
Eliminates TOCTOU races when reading local catalogs.
Changes:
- Removes
exists()pre-checks. - Converts
FileNotFoundErrorintoBundlerError.
Show a summary per file
| File | Description |
|---|---|
src/specify_cli/bundler/services/adapters.py |
Safely handles disappearing local catalog files. |
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mnriem
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Please address Copilot feedback
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Suppressed comments (1)
tests/unit/test_bundler_adapters.py:228
- The test never verifies the stated removal of the
exists()pre-check: an implementation that callsexists()and then catchesFileNotFoundErrorfromread_text()still passes. Assert thatexists()was not called so this regression test actually guards the PR's TOCTOU fix.
with patch.object(adapters.Path, "__new__", return_value=mock_path):
with pytest.raises(BundlerError, match="Catalog file not found"):
fetcher(_source(url))
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Hi @mnriem — I've addressed Copilot's feedback: removed the unused exists() mock setup and added mock_path.exists.assert_not_called() as a regression guard to verify the pre-check was genuinely eliminated. All 20 tests pass. Ready for re-review when you get a chance. |
…ath URLs Remove exists() pre-checks and catch FileNotFoundError from read_text() for both file:// and bare path catalog sources. Also catches OSError/UnicodeError to preserve the decode-error wrapping contract. Add regression test for the TOCTOU fix covering both file:// URLs and bare paths: the mocked Path raises FileNotFoundError from read_text(), proving the exists() removal eliminates the race window, with assert_not_called() as a regression guard that no pre-check remains.
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Problem
catalog_fetch()checksexists()then callsread_text()for bothfile://and bare path URLs. The file can be deleted between the two calls.Fix
Remove the
exists()pre-checks and catchFileNotFoundErrorfromread_text().Testing
BundlerErroris raised when catalog file is missing